A reflective photoelectric switch for a camera and its preparation process

Abstract

The invention relates to the field of pulse technology, and specifically discloses a reflective photoelectric switch for a camera and a preparation process thereof, comprising a transmission plastic shell, a combined card shell, a PCBA control board and a laser receiving and transmitting module, wherein the PCBA control board and the laser receiving and transmitting module are both arranged on the inner side of the combined card shell; by arranging a bright light projection filter spacer, a normal filter spacer and a combined filter spacer for debugging the filtering level when a strong light source interferes, when the infrared light filtering requirement cannot be met, the bright light projection filter spacer is switched to replace the normal filter spacer and placed at the upper end of the point cavity as a bright light source filter, or the bright light projection filter spacer, the normal filter spacer and the combined filter spacer are switched to be staggeredly distributed to form a multi-level filtering structure, and the filtering structure composed of multiple levels ensures the filtering completion of the infrared light of the strong light source, so that the receiving end of the laser receiving and transmitting module can stably obtain the emission signal of the transmitting end.

Description

Technical Field

[0001] The invention relates to the field of pulse technology, in particular to a reflective photoelectric switch used for a camera and a preparation process thereof. Background Art

[0002] The working principle of the reflective photoelectric switch is to determine the existence or position of an object by emitting light and detecting the reflection of light. Since light will diverge when it is emitted, the detected object or receiver will receive light within a certain range. Therefore, when there are other strong light sources within the detection range, it is easy to affect the normal operation of the infrared receiving tube. Traditional photoelectric switches process the high-intensity infrared light generated by the strong light source by setting a filter. This type of photoelectric switch is mostly used in fixed photoelectric measuring points, and its filtering intensity only needs to meet a single parameter, so it can meet application requirements. However, when it is used with a camera, since the camera may frequently move during use, when the distance between the detected object and the strong light changes, its processing intensity cannot be adjusted when filtering infrared light, and its adaptability to the infrared filtering intensity required after the strong light changes in distance is poor, so the conversion efficiency is not ideal. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a reflective photoelectric switch for a camera and a preparation process thereof. The technical solution adopted by the present invention to solve its technical problems is: a reflective photoelectric switch for a camera and a preparation process thereof, comprising a transmissive plastic shell, a combined card shell, a PCBA control board and a laser receiving and transmitting module, the PCBA control board and the laser receiving and transmitting module are both arranged on the inner side of the combined card shell, the transmissive plastic shell is provided with a reflected light receiving slot and a light transmitting slot, an adjustable strong light filter component is arranged on the inner side of the reflected light receiving slot, the adjustable strong light filter component is slidably connected to the reflected light receiving slot, an intermediate connecting leather cavity is arranged on the inner side of the adjustable strong light filter component, the adjustable strong light filter component comprises a bright light projection filter spacer, a normal light filter spacer and a combined light filter spacer, the normal light filter spacer is arranged between the bright light projection filter spacer and the normal light filter spacer, the bright light projection filter spacer and the combined light filter spacer are connected to each other, and the bright light projection filter spacer and the combined light filter spacer are connected to each other. The filter spacers are fixedly connected to the normal filter spacers through the intermediate connecting leather cavity, one end of the bright light projection filter spacer and the combined filter spacer are extended to the inner side of the transmission plastic shell, and the bright light projection filter spacer and the combined filter spacer are slidably connected to the transmission plastic shell, and the ends of the bright light projection filter spacer and the combined filter spacer extending to the inner side of the transmission plastic shell are both provided with a wrapped movable sealed leather cavity, and the wrapped movable sealed leather cavity is used to close the sliding gap between the bright light projection filter spacer and the normal filter spacer, one side of the bright light projection filter spacer and the normal filter spacer is provided with a hand-dial layer adjustment component, the hand-dial layer adjustment component is slidably connected to the transmission plastic shell, and the hand-dial layer adjustment component is used to drive the bright light projection filter spacer and the normal filter spacer to adjust the strong light filtering level.

[0004] Preferably, both side walls of the transmissive plastic shell close to the reflected light receiving groove are provided with embedded access cavities, and the two embedded access cavities are staggered up and down, the bright light projection filter spacer and the combined filter spacer are slidingly connected to the two embedded access cavities respectively, one end of the two wrapped movable sealed leather cavities are fixedly connected to the inner wall of the embedded access cavity, and the other end of the two wrapped movable sealed leather cavities are fixedly connected to the bright light projection filter spacer and the combined filter spacer respectively.

[0005] Preferably, there are two groups of hand-dial layer adjustment components, each group of the hand-dial layer adjustment components includes a long-distance closed slide and a linkage clamping protrusion, the long-distance closed slide is fixedly connected to the linkage clamping protrusion, the transmissive plastic shell is provided with a linkage path distribution cavity, the linkage clamping protrusion is slidably connected to the linkage path distribution cavity, the linkage path distribution cavity is communicated with the embedded access cavity, and the linkage clamping protrusions in the two groups of the hand-dial layer adjustment components are respectively fixedly connected to the bright light projection filter spacer and the combined filter spacer.

[0006] Preferably, the transmissive plastic shell is provided with two symmetrically distributed point-to-point cavities at the bottom of the reflected light receiving slot and the light-transmitting transmitting slot, and the two point-to-point cavities correspond to the positions of the transmitting end and the receiving end of the laser transceiver module respectively.

[0007] Preferably, a light-transmitting middle sealing plate is fixedly connected between the transmissive plastic shell and the assembled card shell, and the light-transmitting middle sealing plate seals the through gap between the counterpoint cavity and the reflected light receiving groove, so as to isolate and seal the assembled card shell.

[0008] Preferably, the transmissive plastic shell, the light-transmissive middle closing plate and the joints between the assembled card shell layers are all bonded by epoxy resin.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting a bright light projection filter spacer, a normal filter spacer and a combined filter spacer for debugging the filtering level when a strong light source interferes, when the infrared light filtering demand cannot be met, the bright light projection filter spacer is switched to replace the normal filter spacer and placed at the upper end of the point cavity as a bright light source filter, or the bright light projection filter spacer, the normal filter spacer and the combined filter spacer are switched to form a multi-level filtering structure after being staggered. The filtering structure composed of multiple levels ensures the filtering completion of the infrared light of the strong light source, and then by switching the composition form of different infrared light filtering hierarchical structures, it adapts to the filtering needs when the detected object and the position and distance of the strong light change, so that the receiving end of the laser receiving and transmitting module can stably obtain the emission signal of the transmitting end. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 The structure of a reflective photoelectric switch for a camera of the present invention is shown in FIG. Figure 1 .

[0012] Figure 2 The structure of a reflective photoelectric switch for a camera of the present invention is shown in FIG. Figure 2 .

[0013] Figure 3 The present invention is a side cross-sectional view of a reflective photoelectric switch for a camera.

[0014] Figure 4 The present invention is a schematic structural diagram of an adjustable strong light filtering component in a reflective photoelectric switch for a camera.

[0015] In the figure: 1. Transmissive plastic shell; 11. Reflective light receiving slot; 12. Light-transmitting transmitting slot; 13. Embedded access cavity; 14. Point cavity; 2. Transmissive middle closed plate; 3. Assembly card shell; 4. PCBA control board; 5. Laser receiving and transmitting module; 6. Adjustable strong light filtering component; 61. Bright light projection filter spacer; 62. Normal filter spacer; 63. Combined filter spacer; 64. Wrapped movable sealed leather cavity; 7. Middle connecting leather cavity; 8. Hand-dial layer adjustment component; 81. Long-distance closed slide bar; 82. Linking card convex; 9. Linking path distribution cavity. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figure 1-Figure 4 As shown, a reflective photoelectric switch for a camera and a preparation process thereof according to the present invention comprises a transmissive plastic shell 1, a combined card shell 3, a PCBA control board 4 and a laser receiving and transmitting module 5. The PCBA control board 4 and the laser receiving and transmitting module 5 are both arranged inside the combined card shell 3. The transmissive plastic shell 1 is provided with a reflected light receiving slot 11 and a light transmitting slot 12. An adjustable strong light filtering component 6 is arranged inside the reflected light receiving slot 11. The adjustable strong light filtering component 6 is connected to the reflected light receiving slot 12. The receiving groove 11 is slidably connected, and an intermediate connecting skin cavity 7 is arranged inside the adjustable strong light filter component 6. The adjustable strong light filter component 6 includes a bright light projection filter spacer 61, a normal light filter spacer 62 and a combined light filter spacer 63. The normal light filter spacer 62 is arranged between the bright light projection filter spacer 61 and the normal light filter spacer 62. The bright light projection filter spacer 61 and the combined light filter spacer 63 are both fixedly connected to the normal light filter spacer 62 through the intermediate connecting skin cavity 7. The bright light projection filter spacer 6 1 and one end of the combined filter spacer 63 are extended to the inner side of the transmission plastic shell 1, and the bright light projection filter spacer 61 and the combined filter spacer 63 are slidably connected to the transmission plastic shell 1, and the bright light projection filter spacer 61 and the combined filter spacer 63 are provided with a wrapped movable sealing leather cavity 64 at one end extending to the inner side of the transmission plastic shell 1, and the wrapped movable sealing leather cavity 64 is used to close the sliding gap between the bright light projection filter spacer 61 and the normal filter spacer 62, and the bright light projection filter spacer 61 and the normal filter spacer A hand-dial layer adjustment component 8 is provided on one side of the normal filter spacer 62, and the hand-dial layer adjustment component 8 is slidably connected to the transmissive plastic shell 1. The hand-dial layer adjustment component 8 is used to drive the bright light projection filter spacer 61 and the normal filter spacer 62 to adjust the strong light filtering level; among them, the bright light projection filter spacer 61 uses a high-performance infrared filter with a thickness of 25mm and a wavelength of 355nm-1064nm, and 62 and 63 use ordinary infrared filters with a thickness of 12.5mm.

[0018] In order to solve the problem that when the photoelectric switch is mounted on a camera and the camera may be frequently moved during use, and when the distance between the detected object and the strong light changes, the processing intensity of the infrared light filtering cannot be adjusted, the present invention adjusts the strong light filtering hierarchical structure by setting an adjustable strong light filtering component 6, an intermediate connecting leather cavity 7 and a hand-dialed layer adjustment component 8 to meet the filtering requirements when the distance between the detected object and the strong light position changes.

[0019] In this embodiment, the bright light projection filter spacer 61, the normal light filter spacer 62 and the combined light filter spacer 63 are provided to adjust the filter level when a strong light source interferes. That is, when the receiving end of the laser receiving and transmitting module 5 is in a normal light source state, the bright light projection filter spacer 61 and the combined light filter spacer 63 are both retracted to the inside of the embedded access cavity 13. At this time, the normal light filter spacer 62 is placed at the upper end of the counter cavity 14 as a basic light filter layer when the receiving end of the laser receiving and transmitting module 5 is interfered by an external light source (as shown in the attached manual). Figure 3 In the state shown in the figure, when the external light source is bright, the hand-operated layer adjustment component 8 removes the bright light projection filter spacer 61 along the inner side of the embedded access cavity 13, and the combined filter spacer 63 is retracted into the inner side of the embedded access cavity 13 until the elastic expansion of the middle connecting skin cavity 7 between the normal filter spacer 62 and the bright light projection filter spacer 61, and the bright light projection filter spacer 61 and the normal filter spacer 62 are changed to be vertically distributed, and the bright light projection filter spacer 61 replaces the normal filter spacer 62 and is placed at the upper end of the point cavity 14 as a bright light source filter, and the receiving end of the laser receiving and transmitting module 5 is affected by the strong light source state. When the conversion efficiency is affected, the bright light projection filter spacer 61 and the combined filter spacer 63 are slid out along the inner side of the embedded access cavity 13 through two hand-operated layer adjustment components 8, so that the bright light projection filter spacer 61, the normal filter spacer 62 and the combined filter spacer 63 are staggered and distributed to form a multi-level filtering structure, thereby improving the completion of infrared light filtering from a strong light source, and then by switching the composition form of different infrared light filtering hierarchical structures, it adapts to the filtering requirements when the detected object and the position and distance of the strong light change, so that the receiving end of the laser receiving and transmitting module 5 can stably obtain the emission signal of the transmitting end.

[0020] In an optional implementation of the present embodiment, both side walls of the transmissive plastic shell 1 close to the reflected light receiving groove 11 are provided with embedded access cavities 13, and the two embedded access cavities 13 are staggered up and down, and the bright light projection filter spacer 61 and the combined filter spacer 63 are slidingly connected to the two embedded access cavities 13 respectively, and one end of the two wrapped movable sealed leather cavities 64 are fixedly connected to the inner wall of the embedded access cavity 13, and the other end of the two wrapped movable sealed leather cavities 64 are fixedly connected to the bright light projection filter spacer 61 and the combined filter spacer 63 respectively.

[0021] In this embodiment, the bright light projection filter spacer 61 and the combined filter spacer 63 can be slid in or out along the staggered inner side of the transmission plastic shell 1 through two embedded access cavities 13. When the bright light projection filter spacer 61 and the combined filter spacer 63 both maintain the retracted and extended state toward the inner side of the embedded access cavity 13, the normal filter spacer 62 is placed at the upper end of the counterpoint cavity 14 under the traction force of the bright light projection filter spacer 61 and the normal filter spacer 62. At this time, the normal filter spacer 62 serves as the basic filter end for the laser receiving and transmitting module 5 to receive the infrared light from the light source. Furthermore, by setting up the wrapped movable sealing leather cavity 64, the open end of the embedded access cavity 13 can be blocked, so that when the bright light projection filter spacer 61 or the combined filter spacer 63 slides outward along the inner side of the embedded access cavity 13, the sliding gap between the bright light projection filter spacer 61 and the embedded access cavity 13 remains sealed, thereby preventing dust from entering from the inner side of the sliding gap between the embedded access cavity 13 and the bright light projection filter spacer 61 or the combined filter spacer 63 during use.

[0022] In an optional implementation of the present embodiment, there are two groups of hand-dial layer adjustment components 8, each group of hand-dial layer adjustment components 8 includes a long-distance closed slide bar 81 and a linkage clamping protrusion 82, the long-distance closed slide bar 81 is fixedly connected to the linkage clamping protrusion 82, the transmission plastic shell 1 is provided with a linkage path distribution cavity 9, the linkage clamping protrusion 82 is slidingly connected to the linkage path distribution cavity 9, the linkage path distribution cavity 9 is connected to the embedded access cavity 13, and the linkage clamping protrusions 82 in the two groups of hand-dial layer adjustment components 8 are respectively fixedly connected to the bright light projection filter spacer 61 and the combined filter spacer 63.

[0023] In this embodiment, the long-distance closed slide bar 81 is used to close the sliding gap when the bright light projection filter spacer 61 and the combined filter spacer 63 slide. At the same time, after the long-distance closed slide bar 81 is fixedly connected to the bright light projection filter spacer 61 or the combined filter spacer 63, the long-distance closed slide bar 81 can be directly driven by the linkage clamp 82 to slide and adjust the application status of the bright light projection filter spacer 61 and the combined filter spacer 63, so that the bright light projection filter spacer 61 and the combined filter spacer 63 can slide into the inner side of the embedded access cavity 13, and can also slide out along the inner side of the embedded access cavity 13 while maintaining the sealing at the sliding gap.

[0024] In an optional implementation of the present embodiment, the transmissive plastic shell 1 is provided with two symmetrically distributed point cavities 14 at the bottom of the reflected light receiving slot 11 and the light transmitting slot 12, and the two point cavities 14 correspond to the transmitting end and the receiving end of the laser receiving and transmitting module 5 respectively.

[0025] In the present embodiment, the point cavity 14 corresponds to the transmitting end and the receiving end of the laser transceiver module 5, and is used to reserve a light source projection window, wherein the transmitting end of the laser transceiver module 5 emits light from the point cavity 14 and transmits it to the detection object through the light-transmitting emitting slot 12, and the receiving end of the laser transceiver module 5 corresponds to the position of the reflected light receiving slot 11, and is used to receive the light source after the returned light is filtered by the adjustable strong light filtering component 6 after the infrared light of the strong light source is filtered.

[0026] In an optional implementation of the present embodiment, a light-transmitting middle sealing plate 2 is fixedly connected between the transmissive plastic shell 1 and the assembled card shell 3, and the light-transmitting middle sealing plate 2 seals the passing gap between the point cavity 14 and the reflected light receiving groove 11, and is used to isolate and seal the assembled card shell 3.

[0027] In an optional implementation of this embodiment, the layered joints between the transmissive plastic shell 1, the light-transmissive middle sealing plate 2 and the assembled card shell 3 are all bonded by epoxy resin.

[0028] In this embodiment, the light-transmitting middle closing plate 2 is a light lens, which is bonded between the transmissive plastic shell 1 and the light-transmitting middle closing plate 2 by epoxy resin, and is used to seal the connection gap between the transmissive plastic shell 1 and the light-transmitting middle closing plate 2, thereby playing a dust-proof role. At the same time, the waterproof sealing performance can also be improved through the partition effect of the light-transmitting middle closing plate 2.

[0029] The working principle of the present invention is: when the receiving end of the laser receiving and transmitting module 5 is in the normal light source state, the bright light projection filter spacer 61 and the combined filter spacer 63 are both retracted to the inner side of the embedded access cavity 13. Due to the support surface formed between the bright light projection filter spacer 61 and the combined filter spacer 63 and the middle connecting leather cavity 7 after they are retracted, the normal filter spacer 62 is in a positioning state. In the current positioning state, the normal filter spacer 62 is placed at the upper end of the point cavity 14, and serves as a basic filter layer when the receiving end of the laser receiving and transmitting module 5 is interfered by an external light source. It is used for applications under the demand of conventional light source filtering. When the photoelectric switch moves as a whole to change the distance with the detection object, when the external light source around the detection object is bright, the operator can push the long-distance closed slide bar 81 through the linkage clamp convex 82 on one side of the bright light projection filter spacer 61 to make the bright light projection filter spacer 61 move along The inner side of the embedded access cavity 13 is disengaged, and the long-distance closed slide bar 81 on one side of the combined filter spacer 63 is pushed, so that the combined filter spacer 63 is retracted into the inner side of the embedded access cavity 13. Since the intermediate connecting skin cavity 7 can elastically shrink and expand, the intermediate connecting skin cavity 7 between the normal filter spacer 62 and the bright light projection filter spacer 61 is elastically deformed with the activities of the bright light projection filter spacer 61 and the combined filter spacer 63. While maintaining the connectivity between the bright light projection filter spacer 61 and the normal filter spacer 62, the placement direction of the bright light projection filter spacer 61 and the normal filter spacer 62 is changed to a vertical distribution. At this time, the normal filter spacer 62 is in a vertical state, and the bright light projection filter spacer 61 replaces the normal filter spacer 62 and is placed at the upper end of the point cavity 14 as the bright light source filtering end, thereby meeting the filtering requirements for the bright light source. After the displacement, the receiving end of the laser receiving module 5 is in the strong light source distribution area, and the conversion efficiency is limited due to the influence of the strong light source. Figure 3 After the state is reached, the long-distance closed slide bar 81 is pushed by two linked latch protrusions 82, so that the bright light projection filter spacer 61 and the combined filter spacer 63 are slid out along the inner side of the embedded access cavity 13 respectively. At this time, the bright light projection filter spacer 61, the normal filter spacer 62 and the combined filter spacer 63 are staggeredly distributed under the elastic connection of the middle connecting leather cavity 7, thereby forming a multi-level filtering structure. The multi-level filtering structure is used to improve the completion of infrared light filtering from a strong light source, and then by switching the composition forms of different infrared light filtering hierarchical structures, it can adapt to the filtering requirements when the detected object and the position and distance of the strong light are changed.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A reflective photoelectric switch for a camera, comprising a transmissive plastic shell (1), a combined card shell (3), a PCBA control board (4) and a laser receiving and transmitting module (5), wherein the PCBA control board (4) and the laser receiving and transmitting module (5) are both arranged on the inner side of the combined card shell (3), and characterized in that: The transmissive plastic shell (1) is provided with a reflected light receiving slot (11) and a light transmitting slot (12); an adjustable strong light filter assembly (6) is arranged inside the reflected light receiving slot (11); the adjustable strong light filter assembly (6) is slidably connected to the reflected light receiving slot (11); an intermediate connecting skin cavity (7) is arranged inside the adjustable strong light filter assembly (6); the adjustable strong light filter assembly (6) comprises a bright light projection filter spacer (61), a normal light filter spacer (62) and a combined light filter spacer (63); the normal light filter spacer (62) is arranged between the bright light projection filter spacer (61) and the normal light filter spacer (62); the bright light projection filter spacer (61) and the combined light filter spacer (63) are both fixedly connected to the normal light filter spacer (62) via the intermediate connecting skin cavity (7); the bright light projection filter spacer (61) and the combined light filter spacer (63) are fixedly connected to the normal light filter spacer (62) via the intermediate connecting skin cavity (7); One end of each of the bright light projection filter spacer (61) and the combined filter spacer (63) extends to the inner side of the transmission plastic shell (1), and the bright light projection filter spacer (61) and the combined filter spacer (63) are slidably connected to the transmission plastic shell (1), and one end of each of the bright light projection filter spacer (61) and the combined filter spacer (63) extending to the inner side of the transmission plastic shell (1) is provided with a wrapped movable sealing leather cavity (64), and the wrapped movable sealing leather cavity (64) is used to close the sliding gap between the bright light projection filter spacer (61) and the normal light filter spacer (62), and one side of each of the bright light projection filter spacer (61) and the normal light filter spacer (62) is provided with a hand-operated layer adjustment component (8), and the hand-operated layer adjustment component (8) is slidably connected to the transmission plastic shell (1), and the hand-operated layer adjustment component (8) is used to drive the bright light projection filter spacer (61) and the normal light filter spacer (62) to adjust the strong light filtering level; Both side walls of the transmissive plastic shell (1) close to the reflected light receiving slot (11) are provided with embedded access cavities (13), the two embedded access cavities (13) are staggered up and down, the bright light projection filter spacer (61) and the combined filter spacer (63) are respectively slidably connected to the two embedded access cavities (13), one end of the two wrapped movable sealed leather cavities (64) are fixedly connected to the inner wall of the embedded access cavity (13), and the other end of the two wrapped movable sealed leather cavities (64) are respectively fixedly connected to the bright light projection filter spacer (61) and the combined filter spacer (63).

2. A reflective photoelectric switch for a camera according to claim 1, characterized in that: The number of the hand-operated layer adjustment components (8) is two groups, each group of the hand-operated layer adjustment components (8) comprises a long-distance closed slide bar (81) and a linkage clamping protrusion (82), the long-distance closed slide bar (81) and the linkage clamping protrusion (82) are fixedly connected, the transmission plastic shell (1) is provided with a linkage path distribution cavity (9), the linkage clamping protrusion (82) and the linkage path distribution cavity (9) are slidably connected, the linkage path distribution cavity (9) is connected to the embedded access cavity (13), and the linkage clamping protrusion (82) in the two groups of the hand-operated layer adjustment components (8) are respectively fixedly connected to the bright light projection filter spacer (61) and the combined filter spacer (63).

3. A reflective photoelectric switch for a camera according to claim 2, characterized in that: The transmissive plastic shell (1) is provided with two symmetrically distributed counterpoint cavities (14) at positions located at the bottom of the reflected light receiving slot (11) and the light transmitting slot (12), and the two counterpoint cavities (14) respectively correspond to the positions of the transmitting end and the receiving end of the laser receiving and transmitting module (5).

4. A reflective photoelectric switch for a camera according to claim 3, characterized in that: A light-transmitting intermediate sealing plate (2) is fixedly connected between the transmissive plastic shell (1) and the assembled card shell (3); the light-transmitting intermediate sealing plate (2) seals the through gap between the counterpoint cavity (14) and the reflected light receiving slot (11), and is used to isolate and seal the assembled card shell (3).

5. A process for preparing a reflective photoelectric switch for a camera, characterized in that: Used to prepare a reflective photoelectric switch for a camera as described in claim 4, the transmissive plastic shell (1), the light-transmissive middle sealing plate (2) and the assembly card shell (3) are all bonded together at the layered joints by epoxy resin.

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